chemistry

what is the mass in grams?

a) 3.011 x 10^23 atoms F
b)1.50 x 10^23 atoms Mg
c)4.50 x 10^12 atoms Cl
d)8.42 x 10^18 atoms Br
e) 25 atoms w
f) 1 atom Au
can you please explain a and b to me then i'll come back later and see if i did the rest right? Thanks in advance

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asked by john
  1. Use stochiometry

    a) Molar mass F = 19g/mol
    so...
    (3.011 x 10^23 atoms F) X (1molF/(6.022 x10^23atoms)X (19g/1mol F) = 9.5 g F

    (1molF/(6.022 x10^23atoms) = Avogardro's Law can be used in any situation such as this. Use it for the rest of the questions listed in the same way shown above.

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    posted by Jess
  2. but how would the answers by in scientific notations

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    posted by john
  3. balls

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